Biston betularia typica and Biston betularia carbonaria, the two types of moth are an example of

Variation

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Incomplete Inheritance

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Sex linked inheritance

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Linkage

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Solution

The correct option is A Variation
Biston betularia typica, (a light coloured peppered moth) and Biston betularaia carbonaria (a dark coloured moth) are two varieties of moth found in England. These two moths belonged to the same species but had a phenotypic variation, one being light in colour and the other being dark. The phenotypic variations affected the population size of both the moths during the time of industrial revolution in England.

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